book

Creating Web Animations

by Kirupa Chinnathambi

March 2017

Beginner

210 pages

English

O'Reilly Media, Inc.

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Know Your Basic HTML, CSS, and JavaScriptAbout Authoring ToolsUsing the Code ExamplesO’Reilly SafariGetting Help/Contacting the AuthorContacting O’ReillyAcknowledgments
What Is an Animation?The Start and End StatesInterpolationAnimations on the WebConclusion
Creating a Simple AnimationWhat Just HappenedThe NameDuration and KeyframesLoopingThe Longhand VersionConclusion
Creating a Simple TransitionWhat Just HappenedThe Longhand VersionConclusion
What Is a Timing Function?Timing Functions in CSSTiming Functions in CSS AnimationsTiming Functions in CSS TransitionsMeet the Timing Function CurveThe cubic-bezier Timing FunctionThe step Timing FunctionConclusion
What Is a Smooth Animation?Creating Responsive 60 fps AnimationsMeet the Animation-Friendly PropertiesPush Element Rendering to the GPUConclusion
It’s Just Property ChangesThe ExampleInitial State Using CSS, Changes Using JSWhat Just Happened?A Tale of Two Styling ApproachesSetting the Style DirectlyAdding and Removing Classes Using JavaScriptAnimating with requestAnimationFrameConclusion
SimilaritiesDifferencesTriggeringLoopingDefining Intermediate Points/KeyframesSpecifying Properties Up FrontInteraction with JavaScriptConclusion

The Starting PointAnimated UnderlineSimple Background Color ChangeCooler Background Color ChangeConclusion
The ExampleThe CSS AnimationThe Easing FunctionConclusion
How the Sliding Menu WorksCreating the Sliding MenuThe Initial PageAdding the MenuMaking the Menu WorkAdding Some Finishing TouchesConclusion
The Basic IdeaThe ContentIt’s Scrolling TimeIdentifying the ElementsModifying the ElementsBuilding It All OutListening to the Scroll EventDetecting When Elements Are VisiblePutting It All TogetherSome Performance ConsiderationsConclusion
The Full HTML and CSSDeconstructing This EffectLooking at the CSSFaking RandomnessSlightly Different Variants of Style Rules + KeyframesAltering Some CSS Properties and Their Values…Inline!Conclusion
Overview of How the Parallax Effect WorksGetting StartedAdding Our Background ElementsThe JavaScriptConclusion
Creating the Sprite SheetThe Actual ImplementationIt’s Animation TimeThe Steps Easing Function in ActionConclusion
Overview of How It WorksThe ContentThe Content (For Realz This Time)What You Just DidClipping the ContentThe Navigation LinksMaking the Content Actually SlideAdding the JavaScriptAdding the TransitionUnderstanding the Code (and More!)What’s Really Going OnThe Role of the data-pos AttributeIt’s All About the JavaScriptConclusion
Until Next Time

Content preview from Creating Web Animations

Chapter 12. The iOS Icon Wobble/Jiggle

When you press and hold an icon on your iOS (iPhone/iPad/iPod) device’s home screen, you’ll get the ability to rearrange the icons or uninstall the app associated with it. That’s really boring and not the interesting part I want you to focus on. The interesting part is what these icons do as a result of you pressing and holding. They wobble and jiggle (aka wobiggle) around. It’s pretty awesome.

Anyway, I thought it would be fun to re-create that effect. After about 30 minutes of fiddling around, you can see my attempt by visiting http://bit.ly/iOSWobble or by looking at Figure 12-1:

Figure 12-1. Each of these icons is wobbling around

In my very humble opinion, this implementation is really really close to what you see on an iOS device.

Anyway, in this deconstruction, you will learn all about how this effect works. It’s going to be a lotta fun. Before you proceed, just make sure you are up-to-date on working with nth-child selectors. Otherwise, your fun will be lessened by a great deal of confusion and possibly crying. You have been warned.

The Full HTML and CSS

Before we go any further, let me throw at you all of the HTML and CSS that makes this example work:

<!DOCTYPE html>
<html>

<head>
  <title>iPhone / iPad Icon Wobble Effect</title>
  <style>
    body {
      background-color: #EFEFEF;
      padding: 25px;
    }